Process of making window-envelops



W. LANGGUTH.

PROCESS OF MAKING WINDOW ENVELOPS.

APPLICATION FILED 0509,1911. RENEWED NOV. 18, I918- Patented June 1, 1920 ATTY UNITED [Sm-ms] PATENT Tom-ca.

MENTS, TO UNITED STATES ENVELOPE COMPANY, OF

SPRINGFIELD, MASSA- CHUSETTS, A CORPORATION OF MAINE. i r

rnocnss or MAKING wimaowmnvnnors,

Specification of lletter's Patent. t t J e 1,192

Application filed December 9, 1911, Serial No. 664,894. Renewed November 18, 1918. SerialNo. 263,101.

To all-whom it may concern} -Be itknown that I, WILHELM at Esslingen, in the Kingdom of Wurttemberg, Empire of Germany, have invented certain new and useful Improvements in vProcesses of Making Window-Envelops, of 'which the following is a specification.

This invention relates to the manufacture of window envelops, money bags withtransparent portions and so forth. The socalled window envelops have been hiththe unfolded envelopblank, which is the cut paper which possesses the stamped out form of the unfolded cover or the like, and covering it on one side inithe Well lmown manner with a coating of Varnish to the size of the required windows or transparency, after which the: blanks having been suflic'iently dried are folded with the varnished side inwardlso that the outer side thereof is mat in accordance with the requirements of the post ofiice, and is capable of being written upon. i v

The process which forms the present invention is distinguished from that hitherto in use for the manufacture of these envelop blanks essentially by the feature that in it the already finished envelops are provided with transparent parts or windows, the outer side whereof is mat in accordance with the regulations and this in such a manner that the coating of varnish which has been applied does not transfer itself to the rear side of the envelop.

The object in view is attainable by the use of a machine, preferably of a rotary type, which operates upon completed en velops. This machine applies to the front or address side of each envelop a coating of varnish, of the requiredsize for the transparent patch, such varnish being preferably composed of resinous oils such as oil of turpentine, and" being of -a balsamic consistency at a-temperature of about 20 Raumur, to the end that there maybe no tendency of the same to penetrate the paper to such amextent as to. cause the adherence of the reverse surface of said front side to the back of-the envelop. -To the coating of varnishthus, applied to the address side of the envelop is imparted the 'quality'of beingmat, orcapable of being written upon, by

r I the application thereto of a specially pre- LANGGUTH, a subject of the German Emperor, residing able substances.

pared paste which in no way impairs the transparency of the patch. The paste is composed of chalk, varnish and drier, for example, but may be composed of other suit velops is very greatly reduced, because in I consequence of the less space required by ,the separate folded envelop as compared with the extended unfolded envelop blanks a very much greater daily output can be attained and the very troublesome sticking together of the blanks by reason of the coating is practically prevented. Moreover thetransparent portions can be applied in any desired form, size and position upon the envelops.

'By the process set forth, not envelops alone but also money bags, wrappings for rolls of coin and-such like may be provided with transparent portions; When desired, I asfor'instance, in the case of money bags, the rendering mat canbe dispensed with.

For the carrying out of the process the machine with rotary motion maybe emthe finished envelops (Figs. 3 and.4) .l1 el 1 95 in position on press cylinder a b, lips, are

at the time they pass cylinder 1), which carries the varnish chch, provided on their front side with acoat1ng of varnish, corresponding in size and shape to thewindow 100 a, while simultaneously the impression of the window frame 03 and of the name of the firm etc; is made.

I Cylinder b or rather its varnish clich re-J' ceives the varnish Joy means of the rubber 105 cylinder e and this in turn is supplied with the varnish by the steel cylinder f which dips in reservoir g, containing the varnish,

' the envelops are fed to an additional machine, which may be of any kind of rapid printing press and which applies the paste. For the proper regulation 0 the distances between cylinders e and f, both sides of the machine frame it are provided with a single arm lever i, adapted to rotate on aneccentric box is on the axis of cylinder f and which forms the bearing-of axis Z of cylinder 6.

By rotating box is by means of the handwheel m, the distance between the cylinders e, f can be regulated, and in accordance the supply of varnish can be lessened or increased. Each lever z" is tightly pressed by ters Patent is:

1. The herein described process which a spring n to a setscrew 0, and an adjustment of this screw 0 will re ulate the pressure of cylinder 6 on cylinfer b or on the varnish cliche. Press cylinder a revolves loosely on an eccentric axis p, which carries on itsextreme end a handlever g. In consequence, a rotation of handlever g raises cylinder a from cylinder 6, and at the same time cylinder e is somewhat removed from cylinder 6 by means of guiderod 1'. As shown by Figs. 5 and 6,the window envelops were formerly constructed in such a manner that the unfolded envelop windows-were on their inner side provided with a layer of varnish c, and the window frame (Z was printed on' the outside. This illustration clearly shows the great advantages of the new process over the old.

The varnish used for transparentizing may be some resinous oil, such as oil of turpentine, having a balsamic consistency.

The above described process requires two working operations: firstly the application In order to be able to finished envelops be treated upon a machine capable of rotary motion and constructed specially for this purpose with automatic motion by the application of. a varnish to which a ,matting substance, such as wax, spermaceti, or the like has been added, giving the preparation the property of drying to a mat surface. This operation of varnishing can be effected at the same time as the gumming ofthe edge and stamping of the firm name so that the envelops are immediately available for use when dried and correspond in every respectito the postal requirements.

WVhat I claim and desire to secure by Letconsists in forming an envelop or a like article and then applying to a portion of the outer surface of the article avarnish having a balsamic consistency at a temperature of about 20 Raumur and to which varnish has been added a matting substance such as wax, spermaceti or the like.

2. The herein described process which consists in applying to a portion of the outer surface of the envelop or like article, a varnish adapted to render said portion transparent, to which varnish has been added a substance adapted to render mat said transparent portion.

In testimony whereof I affix my signature in presence of two witnesses.

VVILHELM LANGGUTH. Witnesses:

RUDOLF VVALTERs,

ERNEST ENTENMANN. 

